/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Global definitions for the ARP (RFC 826) protocol.
 *
 * Version:	@(#)if_arp.h	1.0.1	04/16/93
 *
 * Authors:	Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
 *		Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
 *		Ross Biro
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *		Florian La Roche,
 *		Jonathan Layes <layes@loran.com>
 *		Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#ifndef _LINUX_IF_ARP_H
#define _LINUX_IF_ARP_H

#include <linux/netdevice.h>

/* ARP protocol HARDWARE identifiers. */
#define ARPHRD_NETROM	0	/* from KA9Q: NET/ROM pseudo    */
#define ARPHRD_ETHER 	1	/* Ethernet 10Mbps              */
#define	ARPHRD_EETHER	2	/* Experimental Ethernet        */
#define	ARPHRD_AX25	3	/* AX.25 Level 2                */
#define	ARPHRD_PRONET	4	/* PROnet token ring            */
#define	ARPHRD_CHAOS	5	/* Chaosnet                     */
#define	ARPHRD_IEEE802	6	/* IEEE 802.2 Ethernet/TR/TB    */
#define	ARPHRD_ARCNET	7	/* ARCnet                       */
#define	ARPHRD_APPLETLK	8	/* APPLEtalk                    */
#define ARPHRD_DLCI	15	/* Frame Relay DLCI             */
#define ARPHRD_ATM	19	/* ATM                          */
#define ARPHRD_METRICOM	23	/* Metricom STRIP (new IANA id) */
#define	ARPHRD_IEEE1394	24	/* IEEE 1394 IPv4 - RFC 2734    */
#define ARPHRD_EUI64	27	/* EUI-64                       */
#define ARPHRD_INFINIBAND 32	/* InfiniBand                   */

/* Dummy types for non ARP hardware */
#define ARPHRD_SLIP	256
#define ARPHRD_CSLIP	257
#define ARPHRD_SLIP6	258
#define ARPHRD_CSLIP6	259
#define ARPHRD_RSRVD	260	/* Notional KISS type           */
#define ARPHRD_ADAPT	264
#define ARPHRD_ROSE	270
#define ARPHRD_X25	271	/* CCITT X.25                   */
#define ARPHRD_HWX25	272	/* Boards with X.25 in firmware */
#define ARPHRD_CAN	280	/* Controller Area Network      */
#define ARPHRD_PPP	512
#define ARPHRD_CISCO	513	/* Cisco HDLC                   */
#define ARPHRD_HDLC	ARPHRD_CISCO
#define ARPHRD_LAPB	516	/* LAPB                         */
#define ARPHRD_DDCMP    517	/* Digital's DDCMP protocol     */
#define ARPHRD_RAWHDLC	518	/* Raw HDLC                     */

#define ARPHRD_TUNNEL	768	/* IPIP tunnel                  */
#define ARPHRD_TUNNEL6	769	/* IP6IP6 tunnel                */
#define ARPHRD_FRAD	770	/* Frame Relay Access Device    */
#define ARPHRD_SKIP	771	/* SKIP vif                     */
#define ARPHRD_LOOPBACK	772	/* Loopback device              */
#define ARPHRD_LOCALTLK 773	/* Localtalk device             */
#define ARPHRD_FDDI	774	/* Fiber Distributed Data Interface */
#define ARPHRD_BIF      775	/* AP1000 BIF                   */
#define ARPHRD_SIT	776	/* sit0 device - IPv6-in-IPv4   */
#define ARPHRD_IPDDP	777	/* IP over DDP tunneller        */
#define ARPHRD_IPGRE	778	/* GRE over IP                  */
#define ARPHRD_PIMREG	779	/* PIMSM register interface     */
#define ARPHRD_HIPPI	780	/* High Performance Parallel Interface */
#define ARPHRD_ASH	781	/* Nexus 64Mbps Ash             */
#define ARPHRD_ECONET	782	/* Acorn Econet                 */
#define ARPHRD_IRDA 	783	/* Linux-IrDA                   */
/* ARP works differently on different FC media .. so  */
#define ARPHRD_FCPP	784	/* Point to point fibrechannel  */
#define ARPHRD_FCAL	785	/* Fibrechannel arbitrated loop */
#define ARPHRD_FCPL	786	/* Fibrechannel public loop     */
#define ARPHRD_FCFABRIC	787	/* Fibrechannel fabric          */
	/* 787->799 reserved for fibrechannel media types */
#define ARPHRD_IEEE802_TR 800	/* Magic type ident for TR      */
#define ARPHRD_IEEE80211 801	/* IEEE 802.11                  */
#define ARPHRD_IEEE80211_PRISM 802	/* IEEE 802.11 + Prism2 header  */
#define ARPHRD_IEEE80211_RADIOTAP 803	/* IEEE 802.11 + radiotap header */

#define ARPHRD_PHONET	820	/* PhoNet media type            */
#define ARPHRD_PHONET_PIPE 821	/* PhoNet pipe header           */

#define ARPHRD_VOID	  0xFFFF	/* Void type, nothing is known */
#define ARPHRD_NONE	  0xFFFE	/* zero header length */

/* ARP protocol opcodes. */
#define	ARPOP_REQUEST	1	/* ARP request                  */
#define	ARPOP_REPLY	2	/* ARP reply                    */
#define	ARPOP_RREQUEST	3	/* RARP request                 */
#define	ARPOP_RREPLY	4	/* RARP reply                   */
#define	ARPOP_InREQUEST	8	/* InARP request                */
#define	ARPOP_InREPLY	9	/* InARP reply                  */
#define	ARPOP_NAK	10	/* (ATM)ARP NAK                 */

/* ARP ioctl request. */
struct arpreq {
	struct sockaddr arp_pa;	/* protocol address             */
	struct sockaddr arp_ha;	/* hardware address             */
	int arp_flags;		/* flags                        */
	struct sockaddr arp_netmask;	/* netmask (only for proxy arps) */
	char arp_dev[16];
};

struct arpreq_old {
	struct sockaddr arp_pa;	/* protocol address             */
	struct sockaddr arp_ha;	/* hardware address             */
	int arp_flags;		/* flags                        */
	struct sockaddr arp_netmask;	/* netmask (only for proxy arps) */
};

/* ARP Flag values. */
#define ATF_COM		0x02	/* completed entry (ha valid)   */
#define	ATF_PERM	0x04	/* permanent entry              */
#define	ATF_PUBL	0x08	/* publish entry                */
#define	ATF_USETRAILERS	0x10	/* has requested trailers       */
#define ATF_NETMASK     0x20	/* want to use a netmask (only
				   for proxy entries) */
#define ATF_DONTPUB	0x40	/* don't answer this addresses  */

/*
 *	This structure defines an ethernet arp header.
 */

struct arphdr {
	__be16 ar_hrd;		/* format of hardware address   */
	__be16 ar_pro;		/* format of protocol address   */
	unsigned char ar_hln;	/* length of hardware address   */
	unsigned char ar_pln;	/* length of protocol address   */
	__be16 ar_op;		/* ARP opcode (command)         */

#if 0
	/*
	 *      Ethernet looks like this : This bit is variable sized however...
	 */
	unsigned char ar_sha[ETH_ALEN];	/* sender hardware address      */
	unsigned char ar_sip[4];	/* sender IP address            */
	unsigned char ar_tha[ETH_ALEN];	/* target hardware address      */
	unsigned char ar_tip[4];	/* target IP address            */
#endif

};

#ifdef __KERNEL__
#include <linux/skbuff.h>

static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
{
	return (struct arphdr *)skb_network_header(skb);
}

static inline int arp_hdr_len(struct net_device *dev)
{
	/* ARP header, plus 2 device addresses, plus 2 IP addresses. */
	return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
}
#endif

#endif /* _LINUX_IF_ARP_H */
